The stained glass windows of every colour lighting up the bare white interior have to be seen. Incredible. For a nominal fee to the man on the door, you can head up the various floors within to better appreciate an empty cathedral, then, if you have a good head for heights, all the way to the top of the spire. Fantastic panoramic city views. Be aware that as it's not maintained, there are no safety ropes or guide rails, so this is not for the faint hearted. And watch out for the pigeon nests and chicks on the steps as you go up!